Co-localization of TRPV1 with PKR1, PKR2, and PK2 mRNA in DRG neurons. TRPV1 was revealed by immunostaining (red). PKR1, PKR2 and PK2 expressions were revealed by in situ hybridization (green). Arrowhead () showed cells co-express TRPV1 and PKR1, PKR2 or PK2; arrow (→) indicated cells only express TRPV1; and arrowhead () revealed cells only express PKR1 or PKR2 or PK2. Scale bar = 25 μm.